Temporary file handling is the process of creating, naming, storing, using, and deleting short-lived files that an application needs during normal operation. These files often hold downloads, decrypted data, uploads, caches, or intermediate results, so they must be treated as sensitive even if they are meant to disappear quickly.
It matters in cyber security because mistakes in file lifecycle management can expose data or open a path for exploitation. Weak temporary-name generation, unsafe directories, missing cleanup, or poor path validation can let attackers guess files, overwrite them, read them through local file inclusion, or keep them around longer than intended. Defenses include strict access controls, safe path normalization, random non-guessable filenames, least-privilege permissions, and reliable deletion after use. In security reviews, temporary file handling is a common place where ordinary application code becomes a serious attack surface.